"The internet's slow again." It's one of the most common complaints we hear — from homes, offices, and businesses across Adelaide. And most of the time, the internet connection itself is working perfectly. The problem is the Wi-Fi between the router and the device.
This isn't a criticism — it's genuinely one of the trickiest parts of a modern network to get right. Wi-Fi is invisible, it's affected by things you'd never think of, and the fix is usually simpler than people expect. Here's how to figure out whether your problem is actually your NBN connection or your wireless setup, and what to do about it.
The one test that tells you everything
Before troubleshooting anything else, do this: plug a laptop directly into your router or modem with an Ethernet cable and run a speed test.
That's it. If the wired speed matches (or gets close to) the plan you're paying for, your internet connection is fine. The problem is somewhere between the router and your device — and that means it's a Wi-Fi issue.
This is the single most useful diagnostic step you can take, and it rules out your ISP, the NBN, and your connection type in one go. If the wired test comes back slow too, then yes — it might be a genuine internet issue and worth raising with your provider. But more often than not, the wired result is solid and the investigation shifts to wireless.
Why Wi-Fi is almost always slower than your internet
Wi-Fi is convenient, but it's a compromise. Radio signals lose strength over distance, get absorbed by walls and furniture, and share airspace with every other wireless device in range. Here's what's actually happening.
Walls eat your signal
Every wall, floor, and obstacle between your router and your device weakens the Wi-Fi signal. The impact varies dramatically depending on what the wall is made of:
- Plasterboard/drywall — Relatively Wi-Fi friendly. Around 3 dB of signal loss per wall, which is noticeable but manageable.
- Brick — Significantly worse. A single brick wall can absorb 6–10 dB of signal, which roughly halves your effective speed.
- Concrete — The worst common building material for Wi-Fi. A concrete wall or floor can cause 10–25 dB of loss at 2.4 GHz, and even more at 5 GHz. Two concrete walls between you and the router, and you're likely struggling.
- Metal — Filing cabinets, steel-framed walls, foil-backed insulation, even mirrors can block or reflect Wi-Fi signals almost completely.
Most Adelaide homes and offices are a mix of these materials. If your router is in the front room and you're working out the back — with a couple of brick walls and maybe a concrete slab in between — your Wi-Fi signal may have lost 80–90% of its strength before it reaches your device.
5 GHz is faster but shorter range
Modern routers broadcast on two frequency bands: 2.4 GHz and 5 GHz. The 5 GHz band is faster — it supports higher data rates and is less congested — but it has a much harder time getting through walls and travelling long distances. Its wavelength is roughly half that of 2.4 GHz (60 mm vs 125 mm), which means it's absorbed more readily by solid materials.
In practice, 5 GHz works well in the same room as the router or one room away. Beyond that, your device often falls back to 2.4 GHz for a usable connection — and 2.4 GHz tops out at much lower speeds. This is a common reason people see fast Wi-Fi in one part of the building and slow Wi-Fi in another.
Interference from other devices
Wi-Fi shares its radio spectrum with a surprising number of other devices. Microwaves, baby monitors, cordless phones, Bluetooth speakers, and — most commonly — your neighbours' routers all compete for the same airspace. In a dense Adelaide suburb or an office building, dozens of nearby Wi-Fi networks can be fighting over the same channels, causing congestion, packet loss, and speed drops even when your signal strength looks fine.
Wi-Fi extenders: not the fix you think they are
When Wi-Fi doesn't reach the back of the house or the far end of the office, the first instinct is usually to buy a Wi-Fi extender (sometimes called a repeater). They're cheap, they're everywhere, and they promise to "boost" your signal. The reality is more complicated.
A Wi-Fi extender doesn't create new bandwidth. It receives your router's Wi-Fi signal and rebroadcasts it. That rebroadcasting process comes at a cost:
- Speed is typically halved. A single-band extender uses the same radio to receive and retransmit, meaning it can only do one at a time. The result is that your available bandwidth drops by 50% or more the moment traffic passes through the extender.
- Latency increases. Every hop through an extender adds delay. For video calls, VoIP, and anything interactive, this is noticeable.
- Roaming is often poor. Devices frequently hold onto a weak connection to the extender (or the router) instead of switching to the stronger one. You end up connected to the wrong access point with terrible performance, and your device won't let go.
- Placement is critical. An extender placed too far from the router picks up a weak signal and rebroadcasts a weak signal — just in a slightly different location. It needs to be in the overlap zone where the router's signal is still strong, which is a narrower sweet spot than most people realise.
This doesn't mean extenders are useless — a dual-band extender, carefully placed, can be a reasonable solution for a single room in a home. But if you're relying on a chain of extenders to cover a large house, an office, or a business, you're compounding the speed and latency penalties with every hop. It's worth understanding that an extender is stretching a signal, not strengthening it.
Mesh systems: better, but not magic
Mesh Wi-Fi systems like Amazon Eero, Google Nest Wifi, TP-Link Deco, and Ubiquiti UniFi are a significant step up from extenders. Instead of a single router and bolt-on repeaters, mesh systems use multiple access points that work together as a coordinated network. Your devices roam between nodes seamlessly, and the system manages which node you connect to based on signal quality.
Mesh is a genuinely good solution for many homes and small offices. But it's worth understanding the limits:
- Wireless backhaul still loses speed. When mesh nodes talk to each other wirelessly (which is the default out-of-the-box setup), they're still using Wi-Fi for that link. A dual-band mesh system like the entry-level Eero has to share its 5 GHz radio between serving your devices and communicating with the next node — and that sharing costs bandwidth, just like an extender.
- Tri-band helps. Higher-end mesh systems (like the Eero Pro or UniFi) add a dedicated third radio band for backhaul communication between nodes. This means your device traffic and the inter-node traffic don't compete. It's a meaningful improvement, but it adds cost.
- Ethernet backhaul is always better. If you can run an Ethernet cable between your mesh nodes, do it. Wired backhaul eliminates the wireless bottleneck entirely, turning each node into a full-speed access point. This is the difference between a mesh system that works well and one that works brilliantly.
- Placement still matters. Mesh nodes need to be positioned thoughtfully — too close together and they interfere with each other, too far apart and the wireless backhaul link degrades. Three well-placed nodes will outperform six poorly-placed ones.
A mesh system is a great starting point for improving Wi-Fi coverage. But treating it as a drop-in fix without thinking about placement, backhaul, and the physical environment is how people end up disappointed.
What actually fixes Wi-Fi problems
If you've done the wired test and confirmed your internet connection is fine, here's where to focus — roughly in order of impact.
1. Move your router
Routers are often tucked away in a cupboard, shoved behind the TV, or left wherever the installer put them. But placement has an outsized impact on Wi-Fi performance. Aim for a central, elevated location with as few walls as possible between the router and the areas where you actually use Wi-Fi. Even moving the router from a back room to a hallway can make a noticeable difference.
2. Use Ethernet where you can
This is the most reliable fix of all. Any device that stays in one place — a desktop computer, a smart TV, a games console, a VoIP phone, a printer — should be connected with an Ethernet cable if at all practical. A wired connection delivers the full speed of your internet plan with near-zero latency and no interference. It's consistently 30–50% faster than even a strong Wi-Fi connection, and it frees up wireless capacity for the devices that genuinely need it (laptops, phones, tablets).
A single Ethernet cable from your router to your work desk can transform your internet experience overnight — and a Cat6 cable costs a few dollars.
3. Check your router's age and capabilities
If your router is more than four or five years old, it may simply not be capable of delivering the speeds your plan allows. Wi-Fi 5 (802.11ac) routers top out at around 1.7 Gbps in theory, but real-world speeds are typically 200–400 Mbps under good conditions. Wi-Fi 6 (802.11ax) routers deliver meaningfully better performance — typically 30–40% faster in real-world use — and handle multiple devices more efficiently.
If you're on a fast NBN plan (250 Mbps or above) but using an old Wi-Fi 5 router from across the room, the router is the bottleneck.
4. Consider a mesh system or access points
If a single router can't cover your space — and moving it isn't an option — a mesh system or dedicated wireless access points are the way to go. For homes and small offices, a consumer mesh system (Eero, Nest, Deco) with Ethernet backhaul where possible is a solid approach. For larger offices or businesses, commercial-grade access points with proper cabling and configuration are worth the investment.
5. Run cable to your access points
This is the bit that makes everything else work properly. Whether you're using a mesh system or standalone access points, running Ethernet cable to each one eliminates the biggest source of performance loss. Yes, it means getting a cable through the wall or ceiling — but the improvement in speed, reliability, and latency is dramatic compared to wireless backhaul. It's the difference between a system that sort of works and one that actually delivers what you're paying for.
A quick guide to realistic Wi-Fi speeds
These are rough real-world figures — what you can actually expect from a modern Wi-Fi 6 router under reasonable conditions, not the headline numbers on the box.
| Scenario | Typical speed |
|---|---|
| Ethernet cable direct to router | 95–100% of plan speed |
| Wi-Fi 6, same room, 5 GHz | 70–90% of plan speed |
| Wi-Fi 6, one room away, 5 GHz | 50–70% of plan speed |
| Wi-Fi 6, two rooms away or through brick | 20–40% of plan speed |
| Wi-Fi via extender (single-band) | 10–25% of plan speed |
| Mesh system, wireless backhaul | 40–60% of plan speed |
| Mesh system, Ethernet backhaul | 70–90% of plan speed |
The pattern is clear: the closer you are to a wired connection, the more of your plan speed you actually get to use.
When it really is the internet
Not every problem is Wi-Fi. If your wired speed test also comes back slow, or you're experiencing issues that affect all devices at the same time (including wired ones), the problem may genuinely be with your internet connection. Common causes include:
- NBN congestion — Particularly on FTTN and HFC connections during peak evening hours.
- Plan speed limits — You might simply be on a slower plan than you think. Check what you're actually paying for.
- Provider congestion — Some ISPs don't provision enough bandwidth at the exchange. This is where choosing the right provider matters.
- Hardware faults — A failing NBN NTD (the box on your wall) or a faulty router can cause intermittent dropouts that look like internet problems.
- Connection type limitations — If you're on an older FTTN connection with a long copper run, there's a physical ceiling on what the connection can deliver. An FTTP upgrade may be available.
If the wired test confirms the issue is on the internet side, get in touch with us. We can run diagnostics from our end, check your connection's performance at the exchange level, and work out whether it's a provider issue, an NBN issue, or something at your premises that needs attention.